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We distributed 2690 questionnaires, based on those used in the International Study of Asthma and Allergies in Childhood,1 to parents of children attending 70 day-care centers in 2 cities and 32 villages in Crete, Greece. The questionnaire was modified, on
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N Engl J Med 2003;
349:194-195, Jul 10, 2003.
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